US PATENT SUBCLASS 210 / 478
.~.~.~ Unitary filter medium and radially expandable retainer

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

348  DF  FILTER {25}
473  DF  .~ Resting on supporting receiver, e.g., portable {3}
477  DF  .~.~ Resting on internal stop or surface {3}
478.~.~.~ Unitary filter medium and radially expandable retainer

DEFINITION

Classification: 210/478

(under subclass 477) Apparatus in which a radially expansible retainer, such as a resilient ring or downwardly projecting spring arms, and the filter form an integral unit.

(1) Note. The term "integral unit" means a filter medium and a retainer so connected that the unit cannot be disassembled without destroying the unit or can be disassembled only be removing mechanical connectors, such as a bolt or rivet.

SEE OR SEARCH THIS CLASS, SUBCLASS:

463, for a filter element which may be expandable in a pipe.